Adjustable hammer-mill.



"G. S. TEBBETTS, JR.

ADJUSTABLE HAMMER MILL.

APPLICATION FILED JAN. 16, l9l3.

8 1 y m 1H d 6 I. n O t a DJ UNITED STA. I l

PATENT OFFICE.

GEORGE S. TEBBETTS, JR, OF ST. LOUIS, MISSOURE, ASSIGNGB IIQ MILTQN I. WILLIAMS,

. OF ST. LOUIS, MISSOURI.

ADJUSTABLE HAMMER-MILL. I

Specification of Letters Patent. I May 1 8', 19 15.

Applichtidn filed January 16, 1913. Serial No. 742,465.

To all whom it may concern:

Be it known that I, GEORGE S. Tiaren'rrs, J r., a citizen of the United States, residing at St. Louis, Missouri, have invented a certain new. and useful Improvement in Andjustable Hammer-Mills, of which the following is a full, clear, and exact descrlption, such as will enable others skilled in the art to which it appertains to make and use the 10 same, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a side elevation of my ad uStf able hammer mill partly in section. Fig. 2

is a detail of the hammer mounting taken in section on line 2-2 of Fig. 1. Fig. 3 is a detail in perspective of certain portions of the hammer mounting. Fig. 4: is a fragmentary side view of one of the fixed disks.

My invention relates broadly to mills and specifically to a form of rotary imlis employing series of hammers or heaters which are mounted radially upon a shaft.

The principal object of my invention is to 26 provide a form of mounting for the hammers or 'beaiterswhereby the operating portions of the hammers may be adjusted to or from the shaft and to and from the concave or breaker surface with which they are de- 80 signed to cooperate.

Another ob 'ect of my invention is to provide such a mounting by virtue of which all of the hammers carried upon the shaft may be adjusted simultaneously.

86 Another object of my invention is to provide such an adjustable hammer mounting wherein the hammers may be adjusted by movement of the shaft relative to the hammers.

46 Other and further objects of my invention will be obvious from the description of the particular embodiment of my invention herein illustrated and described.

In the use of rotary hammer mills the hammers and the concaves which cooperate to reduce the material are subject to wear which operates to so reduce the length of the hammers and the surface of the concave as to produce a space between the ends '60 of the hammers and the surface of the corncave. Material lying within this space will not be struckby the hammers, and willnot be reduced, and thus the eiiicien-t capacity of the mill will be materially decreased? To 66 take up thisspace the hammers must be extended from the'shaft, whereby their operating ends may be restored to coiiperative relationship with the concave.

In the device illustrated the mill is provided with the casing 1 which has the hinged cover portion 2 and concave 4:. Av shaft 5 extends through the mill and is adapted to carry and actuate the hammers. At the sides of the grinding Fcylinde'r are disposed fixed disks 6 which are keyed to rotate with 66 the shaft 5. Adjacent to the fixed disks 6 on the shaft are disposed free disks 7 which are adapted to'be rotated on the shaft relative to the disks 6 and may be secured in any circumferential position on the shaft 20 by means of bolts 8 which pass through the free disks 7 and engage any of a series of apertures 9 formed in the fixed disks 6. The free disks 7 are rovided with radial slots 11 to receive sliding blocks 10 which are adapted to slide radially therein.

Splined to the shaft -5 are series of eccentries or cams 12, one series for each series of hammers. The cams of each series are arranged circnmferentially of .the shaft from the cams of the other series so that their major radii or greatest thrust stand at the different points circumferentially 'of the shaft corresponding to the positions of the different series of hammers. Upon each cam of each-series is mounted a hammer mount 14 having a strap 15 which encircles the'eccentrio so that rotation of the shaft relativeto the'mounts causes the latter to'be thrust outwardlyor retracted relative tothe shaft. A rod 16 having its ends seated in a pair of sliding blocks 10 passes through each series of mounts 14, and upon the rod 16 are strung the hammers or boaters 17. Any desired number of eccentrics, mounts and hammers may be employed in each series. When the free disks 7 are secured to the fixed disk 6 by the bolts 8, the rods 16 mounted in the sliding block 10 carried by'the disks 7 hold the mounts 14 and hammers 17 against rotati'on relative to the shaft, so that when power is applied to the shaft with the disks locked together the hammers will be rotated to operate upon the material in the mill. When the free disks 7 are tree from the fixed disks 6 and shaft 5, however, the shaft may be rotated relative to the mounts 14 and hammers '17, the hammers and mounts being held stationary by any suitable means such as by the insertion of a crowbar. When the shaft is thus rotated relative to the mounts 14 and hammers 17 the thrust of the eccentrics 12 operates to move the mounts 14 outwardly or inwardly relative to the shaft, thus positioning the hammers 17 to or from the shaft. Upon this movement of the mounts 14 the rods 16 are permitted to move radially of the shaft by virtue of the sliding blocks 10 in the disks 7.

In the device illustrated provision is made for'six series of hammers with three mounts 14 to each series. The disposalof the eccentrics 12 on the shaft 5 relative to the mounts 14 is such that the maximum thrust of the eccentrics 12 is operative upon the mounts 14 of each series simultaneously so that the hammers of all of the series may be adjusted simultaneously to the same extent. When the hammers have become worn and it is desired to adjust them outwardly the mill is stopped, the cover 2 is swung back, and the bolts 8 are removed, thus rendering the disks 7 free from the shaft, then the shaft 5 may be rotated while the hammersare held against rotation. The rotation of shaft 5 makes the eccentrics 12 effective upon the mounts 14 to move them outwardly or inwardlyv so as to adjust the hammers from or to the shaft. When the hammers have been adjusted to the desired extent the bolts 8 are replaced to engage such of the apertures 9 as may be registered with them, and the hammers are thus re-locked so as to rotate with the shaft.

. In the device illustrated the adjustment of the hammers from their innermost to their outermost extents is secured by a rotation of the shaft relative to the hammers to an extent of 180 degrees.

From the foregoing description it will be obvious that my improvement provides a mounting wherein hammers may be supported upon the shaft and may be adjusted relative to the shaft by movement of the shaft relative to the hammers. It is obvious also that while the form of mounting described is particularly adapted to use with pivoted hammers, it is not limited to such use as the hammers may be in the form of rigid continuations of the mounts.14 extending radially of the shaft. It is obvious also that any number of mounts 14 maybe employed. and that the hammers may be mounted directly upon them.

I am aware that changes other than those suggested may be made in the device illustrated and described without departing from the scope of what I claim to be my invention, therefore it is not my intention that my invention be construed to be limited to the single form shown and described, but that it may be construed to comprehend all obvious modifications and embodiments in which the principle of the device shown is employed.

What I claim is:

1. In a rotary hammer mill the combination, of agrinding surface, a rotary shaft, beaters operated by said shaft and cooperating with the grinding surface, and means whereby said beaters may be adjusted relative to said grinding surface by movement of said shaft relative to said beaters.

2. In a device of the class described, a rotary shaft, beaters mounted upon said shaft, and means whereby saidbeaters may be adjusted radially of said shaft by movement of said shaft relative to said beaters.

3. In a device of the class described, the combination of a shaft, beaters, means whereby said beaters may be rotated by said shaft, and means whereby said beaters may be adjusted radially of said shaft by movement of said shaft.

4. In a device of the class described, a shaft, beaters, means whereby said beaters may be rotated by the rotation of said shaft, and means whereby said beaters may be extended and retracted by rotation of said shaft.

5. In a device of the class described, a shaft, beaters supported by said shaft, disks carried by said shaft for guiding said beaters radially of the shaft, and cams carried by the shaft and adapted to coiiperate with the beaters to move the same radially of. the shaft.

6. In a device of the class described, a shaft, beaters mounted upon said shaft, cams mounted upon said shaft and adapted to cooperate with said beaters to adjust the same upon movement of said shaft relative to said beaters.

7. In a device of the class described, a shaft, cam members carried by said shaft, beater mounts coiiperating with said cam members, beaters carried by said beater mounts,- means for rotating said beater mounts with said shaft, the arrangement of parts being such that all of said mounts may be adjusted radially'of said shaft by rotation of said cam members.

8. In a device of the class described, a shaft, beater mounts supported by said shaft and displaced from one another circumferentially thereof, beaters supported by said beater mounts, and cams carried by said shaft and coiiperating with said heater mounts whereby said beater mounts may be moved radially of said shaft upon rotation of said cams relative to said beater mounts.

9. In a reducing machine having a rotary -driving shaft and a concave, a hammer varying the radial working position of said heaters or hammers, and means for locking said eccentric supports against rotation after adjustment.

In testimony whereof I hereunto afiix my signature in the presence of two witnesses, this 11th day of January, 1913. GEO. S. TEBBETTS, JR. Witnesses: I

FRANK J. R; WEHRLE, PAUL J. JARZEMSKY. 

